Abstract: A fuel cell structure has a membrane electrode assembly , a polar plate mounted in a stacking direction for supplying a reactant to a surface of the membrane electrode assembly, the polar plate comprising a media port as the inlet for the reactant and a media port as the outlet for the reactant as well as a flow field which fluidically connects the two media ports, and an active area being provided in which the electrochemical fuel cell reaction occurs during operation, and a means for producing a region with a reduced reactant flow, which is provided on the inlet side of the flow field . The means is located within the active area at the edge, or extends into the active area at the edge. A fuel cell stack and a motor vehicle including the aforementioned fuel cell structure is also provided.

Abstract: A membrane electrode unit has a seal arranged on the edge region, wherein the seal in part penetrates into the edge region of the membrane electrode unit and in part fully covers the edge region outside the membrane electrode unit, which enables sealing of the gas chambers of a fuel cell and at the same time reliably interrupts a leakage path at the edge in membrane electrode units with flush cut. The membrane electrode unit is surrounded by a sealing frame which at least partially surrounds the edge region with the seal.

Abstract: A membrane electrode unit has a seal arranged on the edge region, wherein the seal in part penetrates into the edge region of the membrane electrode unit and in part fully covers the edge region outside the membrane electrode unit, which enables sealing of the gas chambers of a fuel cell and at the same time reliably interrupts a leakage path at the edge in membrane electrode units with flush cut. The membrane electrode unit is surrounded by a sealing frame which at least partially surrounds the edge region with the seal.

Abstract: The invention relates to a separator plate, a membrane electrode assembly and a fuel cell stack, which are designed for higher voltages. It is provided that in the active region at least one of the cell components contains at least one insulating element which permanently enables different electrical potentials in a cell plane (orthogonal to the stacking direction).

Abstract: The invention relates to a separator plate, a membrane electrode assembly and a fuel cell stack, which are designed for higher voltages. It is provided that in the active region at least one of the cell components contains at least one insulating element which permanently enables different electrical potentials in a cell plane (orthogonal to the stacking direction).